Whistle Indicators ~~~~~~~~~~~'W', or 'W/L' on a square yellow board. The 'W' is a general whistle indicator while the 'W/L' stands for Whistle for Level Crossing. The latter is also seen in Hindi with the characters 'see/pha' == 'seetee bajao - phatak'). Usually provided on approach to unmanned level crossings (and for manned level crossings without a clear view) about 250m away from the level crossing. Similarly, a 'W/B' sign is seen (less often) on approach to a bridge.source:IRFCA

Opting for VIKALP does not mean that confirmed berth will be provided to passengers in alternate train. It is subject to train and berth availability.Once confirmed in Alternate train, Cancellation charges will be as per your berth/train status in alternate train.In this scheme, your boarding and terminating station might change to nearby cluster stations.You can be transferred to any alternate train...more...

opted and departing between 30 minutes to 12 Hours from the scheduled departure of original train, in which you have booked.Option of VIKALP scheme is available at later stage before charting also through booked ticket history link.Please check PNR status after charting.GENERAL TERMS AND CONDITIONS:This scheme is implemented for passengers of all train types and classes.The scheme is applicable to all waiting list passengers irrespective of booking quota and concession.Under this scheme, passengers will opt max 5 trains for VIKALP scheme.VIKALP opted passengers who booked in waiting and remain fully Wait listed after charting will only be considered for allotment in the alternate train.Fully WL passengers opted for VIKALP should check PNR status after charting.No extra charges shall be taken from passenger or any refund shall be provided for difference of fare.Either all passengers of a PNR or none will be transferred to alternate train in same class. The passenger can be considered for shifting to a train leaving from any station amongst the cluster of stations defined by Railways based on the convenience of the passengers to a station serving the destination station on the same analogy.The VIKALP opted passengers who have been provided accommodation in the alternate train will not figure in the wait listed charts of their original train. A separate list of passengers transferred in alternate train will be pasted along with the CONFIRMED and WAITLIST charts.The passenger allotted alternate accommodation can travel in the alternate train on authority of original ERS/SMS.Wait listed passengers of original train shall not be allowed to board the original train if allotted alternate accommodation.Passengers once provided alternate accommodation in alternate train will be treated as normal passengers in alternate train and will be eligible for up gradation.In rare situations, passengers who have been provided alternate accommodation might get dropped/re-allotted in alternate train due to last minute change in composition of the alternate train at the time of chart preparation. So, passengers who have been provided alternate accommodation should check PNR status also after preparation of charts of the alternate train for final status.This information will be available on Call Centre (139), PRS Enquiry Counters, Passenger Operated Enquiry Terminals installed at stations and WEB ENQUIRY on www.indianrail.gov.inWhen VIKALP opted passenger opts to cancel, after he has been given an alternate accommodation, he will be treated as a CONFIRMED passenger and the cancellation rules will apply accordingly.No refund for difference of fare between the original train and the alternate train, including Tatkal charges, will be given to re-allocated passengers.Once an VIKALP opted passenger has been allotted alternate accommodation, journey modification will not be permitted. If required, the passenger will have to cancel the ticket and book a fresh ticket for modified journey.When a passenger who has been allotted alternate accommodation has not performed his journey in the alternate train, he can claim for refunds by filing a TDR request.Train list once selected under VIKALP scheme cannot be changed.VIKALP Scheme once successfully opted cannot be changed.

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